<template>
  <div class="my-tab-bar">
  	<div class="tab-item"
       v-for="(obj,index) in arr" 
       :key="index" 
       @click="btn(index,obj)"
       :class="{current:barbtnindex===index}"
       >
      <!-- 图标 -->
      <span class="iconfont" :class='obj.iconText'></span>
      <!-- 文字 -->
      <span>{{obj.text}}</span>
    </div>
  </div>
</template>

<script>
export default {
    data(){
        return {
            barbtnindex:0,//默认第一个显示 
        }
    },
  props:{
      arr:{
          type: Array,
          required: true,
          validator(value){
            //   value 就是接到的数组 设置让传入长度为2-5
            if (value.length >2 && value.length <5) {
                return true;
            }else{
                console.error("数据源需要2-5位");
                return false;
            }

          }
      }
},
methods:{
    btn(index,theobj){
        // 参一索引用来高亮 参二对象用来子传父将对象里的name传入父
        this.barbtnindex=index;
        this.$emit('changecomfn',theobj.componentName)
    }
}
}
</script>

<style lang="less" scoped>
.my-tab-bar {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 50px;
  border-top: 1px solid #ccc;
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: white;
  .tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}
    
.current {
  color: #1d7bff;
}
</style>